钛合金叶尖保护涂层的制备与表征

Preparation and Characterization of Titanium Alloy Protective Coating

通过对TC4钛合金基体进行表面活化处理,并采用复合电镀技术,在钛合金基体上制备了结合力良好的Ni-c BN复合镀层。研制的复合镀层能够减少航空发动机钛合金叶片叶尖的摩擦磨损、杜绝"钛火"事故。进行了镀层的高温摩擦磨损试验以及与镍基封严涂层的磨削试验,利用扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)等对涂层性能进行表征。结果表明:采用的钛合金基体表面活化处理技术,可保证复合镀层具有良好的结合力;同时,研制的Ni-c BN复合镀层对封严涂层具有良好的磨削能力和较低的摩擦系数,可以有效保护钛合金叶尖。

To solve the problem of friction and wear of titanium alloy blade in aero-engine compressor, we prepared a Ni-c BN composite coating on Ti-6 Al-4 V（TC4） substrate with improved bonding strength by composite electroplating combined with the surface activation of the titanium alloy processing. The friction and wear properties of the coating with the Ni-based abradable seal coating were studied by high temperature friction and wear test, and the results were compared with the TC4 rub with Ni-based abradable seal coating. The coating was characterized by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, and X-ray photoelectron spectroscopy（XPS）. The results show that a well bonded composite coating on the TC4 substrate is obtained after surface activation treatment of titanium alloy substrate. The deposited Ni-c BN composite coating exhibits a very strong grinding ability and low friction coefficient, which provides protection for the titanium alloy tips.